Aluminum coiled material short process continuous nickel plating and alloy process thereof

An alloy process and short-process technology, which is applied in the field of environmental-friendly short-process continuous nickel plating on aluminum heat sinks and its alloy process, can solve problems such as waste, waste of energy consumption of electroless nickel plating, waste of nickel, etc., and achieve continuous and complete coating. No residual stress, the effect of improving economic benefits

Inactive Publication Date: 2009-06-10
JIAXING ZHENGYUAN PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The energy consumption of electroless nickel plating is nearly twice that of electroless nickel plating. Electroless nickel plating is easy to realize automatic production, and the quality is easy to control. Since electroless nickel plating is a self-catalyzed process, nickel deposits will inevitably form on the tank wall, which not only wastes a certain amount of time for nitric acid Removal, and cause waste of nickel

Method used

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  • Aluminum coiled material short process continuous nickel plating and alloy process thereof
  • Aluminum coiled material short process continuous nickel plating and alloy process thereof
  • Aluminum coiled material short process continuous nickel plating and alloy process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] see figure 1 , the technological process of the short flow continuous nickel plating of aluminum coils of the present invention is: degreasing (1) → water washing → degreasing (2) → water washing → pickling → water washing → zinc dipping (1) → water washing → pickling → water washing → dipping Zinc (2) → water washing → pickling → water washing → zinc dipping (3) → water washing → nickel electroplating → water washing → deionized water washing → drying → drying.

[0031] Prepare the pure aluminum surface treatment of sulfamic acid nickel plating solution by following Table 3 formula.

[0032] For aluminum coil samples press figure 1 The process flow and the degreasing, pickling, galvanizing and nickel plating process proposed by the present invention carry out continuous electroplating nickel treatment, wherein degreasing is 60 ℃, 25 seconds; pickling is 25 ℃, 15 seconds; alkali etching is 25 ℃, 15 seconds seconds; electroplating nickel is 60 ℃, 90 seconds. After t...

Embodiment 2

[0038] Working conditions: concentration of nickel sulfamate 150g / l, 300g / l, 500g / l, 650g / l, 800g / l, electroplating time T, current density I, additive concentration 3ml / l), each additive concentration 4 slices, marked for experiment. The first piece inspects the appearance of the coating and tests the thickness, the second piece tests its welding performance, the third piece tests the wetting performance of the coating, and the fourth piece tests the ductility. Choose a better main salt concentration C. The experimental results are shown in Table 2.

[0039] Table 2 Experiments of main salt concentration conditions

[0040]

[0041]

[0042] From the above experimental results, when the main salt concentration is greater than 300g / l, the appearance, wettability, welding performance and stamping performance of the coating are all qualified. Under the situation that all aspects are qualified, compare the thickness of the coating, when the main salt concentration is 500...

Embodiment 3

[0044] Under the optimal temperature, time and concentration, the times of galvanizing are 1, 2, and 3, and the galvanized aluminum sheets obtained at different times are electroplated under the best electroplating process to test the bonding force between the coating and the substrate. The method is bent to see Whether there is peeling phenomenon. The zinc-dipping layer obtained under each number of times is subjected to a microscopic appearance test (morphology and composition tested by an electron probe), and the optimal number of times of zinc-dipping is selected. Figure 4a , Figure 4b Electron probe photo of zinc-iron alloy layer obtained by zinc dipping in Zn dipping solution. Figure 4a For a zinc dip, Figure 4b Dip zinc three times.

[0045]Comparing one-time zinc dipping and three-time zinc dipping, it can be found that the grains of zinc-iron alloy layer obtained by one-time zinc dipping are coarse and loose, so multiple zinc dipping can reduce the size of zinc...

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Abstract

The invention provides a process for short continuous nickel and nickel alloy plating of aluminum coil. The process comprises the following steps: a, pre-treating the surface of the aluminum coil: degreasing, water washing, acid washing, water washing, zincing, and water washing; removing mould release agent, oxide films and impurities on the surface of the aluminum coil, and forming an electroplating bottom layer on the surface of the aluminum coil, which is firmly bonded with the surface of the aluminum coil; b, electroplating nickel and water washing with the pH value of plating solution of between 3.0 and 6.0 and at a temperature of between 50 and 70 DEG C; adopting nickel sulfamate plating solution for nickel electroplating, which comprises the following components: 100 to 1,000g / L of liquid nickel sulfamate, 10 to 100g / L of boric acid, 10 to 100g / L of nickel chloride, 0.1 to 20ml / L of PPS containing brightening agent, and the balance being water; and c, water washing, blow-drying and drying. The process can improve production efficiency of aluminum radiating fins, and is environment friendly.

Description

technical field [0001] The invention provides a metal surface treatment technology, specifically an environment-friendly short-flow continuous nickel plating and alloy technology for an aluminum heat sink of an aluminum coil. Background technique [0002] With the development of 3C products such as computers, mobile phones, and consumer electronics in the direction of thinner and smaller, more high-performance components are integrated in a small space, and the problem of heat dissipation has become very prominent. The current development trend of heat sinks for portable electronic products is to use nickel-plated aluminum alloy heat sinks to dissipate heat. [0003] The domestic production of aluminum heat sinks mainly adopts the electroless nickel plating process, while foreign companies such as Europe, America, and Japan have begun to adopt environmentally friendly and efficient continuous electroplating. Compared with electroless nickel plating, electroless nickel plati...

Claims

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Application Information

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IPC IPC(8): C25D7/06C25D3/12C25D5/30
Inventor 沈松林李明华
Owner JIAXING ZHENGYUAN PLASTIC
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